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epoxy dome bond wires “ silver cup” reflector Design Growth Processing Packaging Characterization A packaged LED Different parts of an LED Process flow: 交通燈 全彩顯示 Radiometry Photometry Power Watt (W) lumen (lm) Power per unit area W/m2 lm/m2 = lux (lx) Power per unit solid angle W/sr lm/sr = candela (cd) Photometry is just like radiometry except that everything is weighted by the spectral response of the eye 光學(xué)知識 Solid angle: sr = 2 ? (1 cos(θ/2)) 立體角 : 如何理解光通量 (Lumen)和發(fā)光強(qiáng)度 (Mcd) 470nm LED: 3000mcd (20mA) P*(lm)/Sr(15Deg)=3cd P*P== 市場上 : 謝謝大家! ? 靜夜四無鄰,荒居舊業(yè)貧。 ,